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If you handload and want real control over how tight your case necks grip the bullet, this is the part that lets you do it. The L.E. Wilson .310 Neck Sizer Die Bushing is a precision steel insert that drops into a compatible Wilson die and sizes the outside of your case neck down to .310 inches. Swapping bushings is how you fine tune neck tension to match your exact brass thickness and bullet diameter, instead of being stuck with whatever a fixed die gives you.
Running an interchangeable bushing instead of a traditional expander ball tends to keep your necks more concentric and is easier on your brass over the long haul, since the neck is not getting stretched out and pulled back on every cycle. That means better runout numbers and more reloads out of a batch of cases. L.E. Wilson has been building reloading tools for decades, and these bushings are made in the USA to tight tolerances, which is exactly what you want from the one piece that touches every case you size.
Two easy ways to land on the correct size. The quick method is to measure the outside diameter of a loaded round at the neck, then subtract .002 to .003 inch. That drop accounts for brass springing back after sizing and leaves you with roughly .001 to .002 inch of grip on the bullet. The other route is to measure your neck wall thickness, multiply by two, add your bullet diameter, then subtract that same .002 to .003 inch. Either way gets you to the number stamped on the bushing you need.
This bushing is designed for L.E. Wilson neck dies and Wilson bushing type full-length sizing dies, with the die body sold separately. Many reloaders keep a small range of sizes on hand so they can adjust tension as their brass changes over its life. It is a small part that makes a real difference in how repeatable your loads come out.
It tells you the bushing sizes the outside of your case neck to .310 inches. L.E. Wilson names every bushing by the diameter it produces, following their standard thousandths of an inch convention. So a .310 bushing gives you a .310 sized neck before spring-back.
The .310 bushing is made for L.E. Wilson neck dies and Wilson bushing type full-length sizing dies. The die body itself is sold separately, so you will need a compatible Wilson bushing die to use it. Many reloaders also report these drop into Redding, RCBS and Hornady bushing dies, though Wilson builds them for their own dies first.
Measure the outside diameter of a loaded round at the neck, then subtract .002 to .003 inch to get your bushing number. You can also measure neck wall thickness, double it, add bullet diameter, then subtract that same .002 to .003 inch. That small amount accounts for brass springing back and leaves you with proper grip on the bullet.
Sizing with a bushing works the neck from the outside and lets you skip a conventional expander ball, which tends to give you straighter, more concentric necks. It is also gentler on your brass since the neck is not being stretched and pulled back every time you size. Over a batch of cases that usually means better accuracy and longer brass life.
| UPC | 815145025005 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | B-310 |
| Shipping Weight | 0.02 |
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